DataList::CancelCommand Event

.NET Framework (current version)

Occurs when the Cancel button is clicked for an item in the DataList control.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)

Syntax

public:
event DataListCommandEventHandler^ CancelCommand {
	void add(DataListCommandEventHandler^ value);
	void remove(DataListCommandEventHandler^ value);
}

Remarks

The CancelCommand event is raised when the Cancel button is clicked for an item in the DataList control.

A typical handler for the CancelCommand event sets the EditItemIndex property to -1 (to deselect the item) and then rebinds the data to the DataList control.

Caution
Text is not HTML encoded before it is displayed in the DataList control. This makes it possible to embed script within HTML tags in the text. If the values for the control come from user input, be sure to validate the values to reduce security vulnerabilities.

For more information about handling events, see How to: Consume Events in a Web Forms Application.

Caution
This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard Controls, How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Validating User Input in ASP.NET Web Pages.

Caution

This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard Controls, How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Validating User Input in ASP.NET Web Pages.

Examples

The following code example demonstrates how to specify and code a handler for the CancelCommand event. It cancels any edits made to an item in the DataList control when the Cancel button is clicked.

Note
The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model.